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Consolidated Statements of Stockholders' Equity - USD ($)
Total
Common Stock Shares [Member]
Non-Redeemable Preferred Stock [Member]
Capital in Excess of Par Value [Member]
Retained Earnings [Member]
Treasury Stock-Common [Member]
Balance at Dec. 31, 2012 $ 354,497,000 $ 2,673,000 $ 3,000,000 $ 165,006,000 $ 212,192,000 $ (28,374,000)
Balance, shares at Dec. 31, 2012   26,731,000        
Net income (loss) 54,962,000       54,962,000  
Dividends paid on convertible preferred stocks (300,000)       (300,000)  
Stock-based compensation 1,542,000     1,542,000    
Exercise of stock options 1,014,000 $ 12,000   1,002,000    
Exercise of stock options, shares   115,000        
Excess income tax benefit associated with stock-based compensation 0          
Balance at Dec. 31, 2013 411,715,000 $ 2,685,000 3,000,000 167,550,000 266,854,000 (28,374,000)
Balance, shares at Dec. 31, 2013   26,846,000        
Net income (loss) 19,634,000       19,634,000  
Dividends paid on convertible preferred stocks (300,000)       (300,000)  
Stock-based compensation 1,925,000     1,925,000    
Exercise of stock options 1,074,000 $ 12,000   1,062,000    
Exercise of stock options, shares   122,000        
Excess income tax benefit associated with stock-based compensation 0          
Balance at Dec. 31, 2014 434,048,000 $ 2,697,000 3,000,000 170,537,000 286,188,000 (28,374,000)
Balance, shares at Dec. 31, 2014   26,968,000        
Net income (loss) (34,765,000)       (34,765,000)  
Dividends paid on convertible preferred stocks (300,000)       (300,000)  
Dividend accrued on redeemable preferred stock (2,287,000)       (2,287,000)  
Accretion of redeemable preferred stocks (686,000)       (686,000)  
Stock-based compensation 2,346,000     2,346,000    
Exercise of stock options $ 1,785,000 $ 16,000   1,769,000    
Exercise of stock options, shares 159,348 160,000        
Common stock issued for services $ 156,000     156,000    
Common stock issued for services, shares   4,000        
Restricted stock granted from treasury stock       (3,842,000)   3,842,000
Common stock warrants issued 22,300,000     22,300,000    
Common stock warrants issuance costs (1,613,000)     (1,613,000)    
Excess income tax benefit associated with stock-based compensation 596,000     596,000    
Balance at Dec. 31, 2015 $ 421,580,000 $ 2,713,000 $ 3,000,000 $ 192,249,000 $ 248,150,000 $ (24,532,000)
Balance, shares at Dec. 31, 2015   27,132,000